MYOG USB power bank

[Jerry Adams]

nice project

if you’re wearing a down jacket, you’d probably want to keep the battery warm inside your jacket

that would work really well if you were base camped.  Battery will charge when you’re walking around during the day

[Stefan H]

Missed my point about the temperature. And it’s an important one. As far as I can see, the battery does not have a thermal shutoff. So, if, for example, you wrapped the battery in closed cell foam to protect it and use it to charge your phone at 2amps, it will get dangerously hot. Even in the winter, if it’s packed deep in your bag in some fluffy clothing, using it to charge your phone, I wouldn’t be surprised if it got hot enough to cause some damage.

I use the battery just as a power bank, not inside a device. So initially I wrapped it with some cushy bicycle grip tape. While discharging, it quickly got hot enough to melt the adhesive. So I made a simpler, removable sleeve.

[Jerry Adams]

wow, I’m surprised it got so hot

[Author]

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